As of what date has it been mandatory to recycle HFC-134a and other automotive refrigerants before returning to MVACs or selling?

The requirement to recycle HFC-134a and other automotive refrigerants before they can be returned to Motor Vehicle Air Conditioners (MVACs) or sold was established to ensure that refrigerants are handled properly to minimize environmental impact. This requirement came into effect on January 29, 1998.

This date is significant because it reflects the EPA’s commitment to controlling the release of potentially harmful substances into the atmosphere. The regulation ensures that service technicians will only use recycled refrigerants that meet specific purity standards, thus preventing the introduction of contaminants into the MVAC systems. This effort is part of broader initiatives aimed at reducing ozone depletion and promoting environmental protection.

Prior dates mentioned in the other options do not align with this specific regulation regarding automotive refrigerants' recycling requirements. Thus, understanding that January 29, 1998, marks the critical point for regulatory compliance regarding HFC-134a helps you remember the chronology of environmental safeguards in automotive service contexts.